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0
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1answer
49 views

How to plot trajectory for a differential equation in polar coordinates? [duplicate]

I have a differential equation for dr/dt and d[Theta]/dt in terms of r and theta, and I am trying to plot the trajectory in the x-y plane for a given initial condition (r,theta). ...
1
vote
3answers
142 views

How do I find the area between two polar curves?

More specifically above r=6 and below r=4+4cos(θ) graph of the two curves PolarPlot[{6, 4 + 4 Cos[t]}, {t, 0, 2 Pi}]
0
votes
0answers
80 views

spherical histogram for 3D object

I want to develop a shperical histogram for 3D object. Given a 3D object, I put it in a cylinder where its axis pass through the centroid of the object. The cylinder is sampled into a number N of ...
1
vote
2answers
163 views

3D Sphere Plot + Points [closed]

I'm currently trying to create a 3D plot of a sphere along with four points of different colour, using the following code: ...
3
votes
2answers
164 views

Different between two graph in the Polar Plane

How can I plot $\theta=\cos r$ in polar plane? Of course I know that is different with $r=\cos \theta.$
0
votes
1answer
79 views

3D sphere plot, along with singular points [closed]

I have very little experience with mathematica, what I am trying to do is plot 4 points on 3D axes, say a,b,c,d and then also plot a sphere radius r centred on a. Any help would be much ...
4
votes
4answers
137 views

What is wrong with this code?

I am plotting polar curves with PolarPlot and I tried plotting a parabola with $\frac{2}{1-\cos x}$ and $\sec x$. Obviously there are two singularities that have ...
6
votes
2answers
124 views

PolarPlot with Dashed and PlotRange freezes for simple function

When I plot PolarPlot[1/(1+Cos[6-t]), {t,0,2\[Pi]}, PlotRange->{{-4,4},{-4,4}}, PlotStyle->Dashed] everything works normally, but when I change the ...
5
votes
1answer
355 views
15
votes
2answers
824 views

How to wrap a plot around a circle?

Consider the code a = Table[BesselJ[i, x], {i, 0, 3}] Plot[a, {x, 0, 20}, Axes -> False] producing I'd like to transform the plot into a circle. In other ...
0
votes
1answer
191 views

Order contour points in clockwise

I want to describe shape of an object using contour points descriptor. Given a silhouette (image black white of an object), I extrait the contour points using EdgeDetect[] fonction. After that, I need ...